Found a bunch on Internet Archive
From The Lost Media Wiki
Marianne Faithfull: https://archive.org/details/behind-the-music-marianne-faithfull-vh-1-may-1999 1977: https://archive.org/details/behind-the-music-1977 Joe Cocker: https://archive.org/details/joe-cocker_202307 Twisted Sister: https://archive.org/details/behind-the-music-twisted-sister Blues Traveler: https://archive.org/details/blondie-behind-the-music/Blues+Traveler+Behind+The+Music.mp4 Judas Priest: https://archive.org/details/blondie-behind-the-music/Judas+Priest+++Behind+The+Music.mp4
Bonus: There's an episode for the band Deep Purple, which isn't on our current running list of episodes: https://archive.org/details/blondie-behind-the-music/deep-purple-story-freedownloadvideo.net.mp4